Cassette storage unit



FIG. 1 is a perspective view from above of a cassette storage unit according to my design;

FIG. 2 is a horizontal section of the unit taken along the lines 2--2 of FIG. 1;

FIG. 3 is a plan view of the unit;

FIG. 4 is a front vertical section of the unit taken along the lines 4--4 of FIG. 3;

FIG. 5 is a front elevation of the unit;

FIG. 6 is a side elevation of the unit taken along the lines 7--7 of FIG. 5; and

FIG. 7 is a side vertical section of the unit. 

The ornamental design for a cassette storage unit, substantially as shown and described. 